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Stains should be treated with a proprietary stain block. These can be water-based (ok for light stains), aerosol-based (easy to apply, fairly fast-drying and ok for heavier stains although several coats may be required) or oil-based (for heavy stains).
Stains on wall and ceiling surfaces especially can spoil the entire finished product if not treated properly before emulsion is applied. As part of your pre-work checklist look for stains since they will need to be treated and allowed to dry thoroughly before emulsion can be applied.
Light stains may be satisfactorily treated with either a water-based primer such as Zinsser Bullseye 1-2-3™ or a spray-on one such as Zinsser B-i-n Primer Sealer™.
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